Meeting in the Radiation Laboratory at the University of California, Berkeley (UCB) in March 1940 to discuss the 184-inch cyclotron. From left: 1939 Physics Laureate Ernest O. Lawrence, 1927 Physics Laureate Arthur H. Compton, Vannevar Bush, James B. Conant, Karl Compton, and Alfred Loomis.

Source: Lawrence Berkeley Laboratory Public domain via Wikimedia Commons